Exercise bicycle seat



FIG. 1 is a perspective view of the design for an exercise bicycle seat;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front elevation view thereof;

FIG. 5 is a rear elevation view thereof; and

FIG. 6 is a side elevation view thereof. 

The ornamental design for an exercise bicycle seat, as shown. 